P0102: Mass Air Flow (MAF) Sensor Circuit Low Input

written by Edmunds.com^{This story was created with generative AI and was reviewed and fact-checked by our staff of editors and experts.}
edited by Steven Ewing^{Director, Editorial Content
Steven Ewing has worked in the automotive industry since 2003. In that time, he's written thousands of articles and tested just as many vehicles. Steven is Edmunds' director of editorial content and has previously been on staff at Winding Road magazine, Autoblog, Motor1.com, CNET, and was the U.S. correspondent for Top Gear magazine. Steven has also contributed to Automobile magazine, Car and Driver, The Drive, Jalopnik, Porsche Panorama, and dozens of other publications. In his spare time, Steven loves to play the drums, cook, and drive his 2000 BMW M Roadster.}
11/13/2024
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The P0102 error code stands for "mass air flow (MAF) sensor circuit low input." This code is triggered when your vehicle's engine control module detects a low-voltage signal from the MAF sensor. The MAF sensor measures the amount of air entering the engine, which is crucial for calculating the correct air-fuel mixture for optimal combustion.

Importance of addressing P0102

The MAF sensor is a key component in maintaining the engine's correct air-fuel ratio. A malfunctioning MAF sensor can lead to improper fuel management, causing the engine to run too rich or too lean. Ignoring this issue can decrease fuel efficiency, increase emissions, or even damage the catalytic converter over time.

Can I safely drive with this error code?

This is not recommended. A faulty MAF sensor may cause reduced engine performance, rough idling and increased fuel consumption. Long-term driving with this issue can damage the engine and exhaust components.

Common symptoms of P0102

Your vehicle's check engine light is on
The vehicle idles roughly
You notice reduced fuel efficiency
The vehicle accelerates poorly or with hesitation
You notice black smoke from the exhaust

Diagnosing P0102

To diagnose the P0102 code, technicians typically follow these steps:

OBD-II scanner: Use an OBD-II scanner to retrieve the P0102 code and any related codes stored in the engine control module.
Visual inspection: Inspect the MAF sensor, wiring and connectors for visible damage, dirt or loose connections.
Test MAF sensor voltage: Use a multimeter to measure the MAF sensor voltage output to ensure it falls within the manufacturer’s specifications.
Check air filter: Examine the air filter to ensure it is clean and not causing airflow restrictions.
Inspect intake system: Inspect the intake system for any air leaks that may affect the sensor readings.

Repairing P0102

Repairing the P0102 code may involve the following steps:

Clean or replace the MAF sensor: If the MAF sensor is dirty, it can be cleaned with a specialized cleaner. If it's faulty, it should be replaced.
Replace the air filter: A clogged or dirty air filter should be replaced to ensure proper airflow.
Repair wiring or connectors: Any damaged wiring or loose connectors related to the MAF sensor circuit should be repaired or replaced.
Clear the code: After completing repairs, the error code should be cleared from the engine control module using an OBD-II scanner. A test drive should be done to confirm the issue is resolved.